In order to overcome the buckling failure in the in-plane compression mechanical testing of metal thin plates,this paper proposed an improved method by the self-balancing of the specimen to suppress the premature buckling by the single-sided grooves of dogbone specimen.First,the previous fixture and specimen of this method was designed and optimized.The feasibility and universality of this method were demonstrated through theoretical analysis and simulation analysis.Second,this method was applied in uniaxial in-plane compression testing of four types metal sheets.Additionally,uniaxial tensile tests were conducted for the purpose of comparison.The experimental results indicate that this method can effectively suppressed the premature buckling.The strain was obtained accurately in the length and width direction of the specimen by using the Digital Image Correlation method(DIC).The anisotropy coefficient(r-value)can subsequently be calculated precisely.
关键词
金属薄板/面内压缩/力学性能测试/自平衡原理/数字图像相关法
Key words
metal sheet/in-plane compression/mechanical testing/self-balancing/digital image corre-lation
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